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is the y8 still running? from what i know about vtec-e you are probably running very lean up to the first vtec point then when you switch to the 4 valve map you are probably still a little lean (running a 'true' vtec cam when the ecu thinks its just in 4 valve) then when you switch to the final cams map in the ecu you finally are in the neighborhood, except that the whole time you have been running on undersized injectors. do you have a wideband (friend with wideband)?
yes it actually runs very well (i should put a vid up of me running at ams friday drags). the only problem i feel is that when it hits 2800 and goes into the second fuel map it kinda feels like a bog for a second and picks up with plenty of torque. with the new clutch and the torque of the y8 i can even chrip third for about almost a second and the y8 is fully stock. also im soon to have my turbo setup complete and start installing. and yes i do have wideband.
I was in the Vtec E club for about a year. I did love the 35-40 MPGs my 98 Hx got. I managed to run a 15.919 ET in it with just a CAI and an axle back exhaust. Now it has a LS Vtec swap in it.
Hey, hey, hey,
Can I be added to the VTEC-E squad, I have a 1997 HX coupe, (probably the only one in Bahrain) and have a lot of time on my hands and am really researching this modification with my y5 cylinder head on a y8 block. Still reading through threads upon threads. (Good stuff) Thanks everyone for the info.
Last edited by dmncj; Jul 20, 2014 at 11:59 PM.
Reason: Reword
Lots of haters seem to jump in and give their opinions here, I just started working on my basic plan for my 92 VX.
01 PMS-A00 0.25 over pistons and rings
D16Y8 head with the Z1 valvetrain swapped over
D16Y8 intake manifold with a D16Z6 throttle body
A good header
AEM electronics perhaps even so far as a distributor delete COP modification
ACT rigid clutch and ACT light weight flywheel
Possibly a Si brake upgrade
11:1 static compression
E85 fuel
Adding front and rear anti roll bars, as well as eibach multi pro r2 coilovers, power steering and a few other basic creature comforts like cruise control and power windows
Looking for this to be a fun daily driver not a huge power build. I'm guessing 170hp max.
Lots of haters seem to jump in and give their opinions here, I just started working on my basic plan for my 92 VX.
01 PMS-A00 0.25 over pistons and rings
D16Y8 head with the Z1 valvetrain swapped over
D16Y8 intake manifold with a D16Z6 throttle body
A good header
AEM electronics perhaps even so far as a distributor delete COP modification
ACT rigid clutch and ACT light weight flywheel
Possibly a Si brake upgrade
11:1 static compression
E85 fuel
Adding front and rear anti roll bars, as well as eibach multi pro r2 coilovers, power steering and a few other basic creature comforts like cruise control and power windows
Looking for this to be a fun daily driver not a huge power build. I'm guessing 170hp max.
Why not just use the HX head? D16y8 and D16y5 heads are the exact same part number.
Why not just use the HX head? D16y8 and D16y5 heads are the exact same part number.
I have neither the Y5 or Y8 heads so my main reason would be a Y8 complete head and intake manifold are in the plan.
I have nothing against using the HX cylinder head at all, if they are the exact same casting and part number there really is no functional difference between the two.
The HX intake manifold is not what I'm looking for in this build at all. While the HX manifold looks similar to the Y8 manifold I am not interested in the EGR portion of it.
93 vx that is mostly stock at the moment...including the ugly teal paint.
I'm interested in the Z1 cam specs, mostly the duration and ramp rates (I think I've got access to the lift numbers but have not verified so don't want to add incorrect info to the net), if anyone has the info in any format that would be great. My understanding is the intake side max lift is actually higher than the Z6/Y8 I've been unable to find duration numbers for either the intake or exhaust lobes.
My plan is a bit out of the norm;
I have a large rod journal D15B crank to replace my small journal Z1 crank.
I'm going to use vitara spec long rods, 0.5mm over D17 pistons with the tops milled to zero deck on my appropriately machined Z1 block. This piston milling will be in the realm of 0.889mm +whatever is needed to true up the block.
I'm not exactly getting much by way of interest from the cam grinders out there, except the "stupid idea is stupid" type stuff that pretty much let's you know those aren't the folk you want to work with.
My thought is I can chunk out the math and figure out valve relief cuts on the pistons if needed or not.
A little GT2554R based turbo system will add all the pep I'll want in the canyons around my home. D16Y8 rocker cover VTEC-E rocker cover D15Z1 intake manifold, tiny little thing
I'll take the 666th spot, 69th spot, or both.
Yeah, I dug this up from the depths of thread oblivion, and even added a little useful content.
I've got threads where I've written about almost exactly what you're describing. Its an interesting project. I wound up going another route.
I'm at a point in my life, career where I cannot allow myself to venture off into academic projects such as VTEC-E. I am able to continue to pursue my passion with building Honda transmissions because I'm doing stuff for J-series / FK8 Type R. There's pretty much zero possibility of being able to earn money working on Hondas by developing parts / pursuing engineering projects that would cater to the fuel efficiency crowd. You'd end up doing more work, making less money.
Re: d15z1 / d16y5 VTEC-E Squad!
now IS a good time!!
